From ecca25029473bee6e98ce062e76b7310904bbdd1 Mon Sep 17 00:00:00 2001 From: Zhao Yakui Date: Tue, 30 Apr 2019 11:45:23 +0800 Subject: x86/Kconfig: Add new X86_HV_CALLBACK_VECTOR config symbol Add a special Kconfig symbol X86_HV_CALLBACK_VECTOR so that the guests using the hypervisor interrupt callback counter can select and thus enable that counter. Select it when xen or hyperv support is enabled. No functional changes. Signed-off-by: Zhao Yakui Signed-off-by: Borislav Petkov Reviewed-by: Borislav Petkov Reviewed-by: Thomas Gleixner Cc: Boris Ostrovsky Cc: Frederic Weisbecker Cc: Haiyang Zhang Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Juergen Gross Cc: "K. Y. Srinivasan" Cc: linux-hyperv@vger.kernel.org Cc: Nicolai Stange Cc: Paolo Bonzini Cc: Peter Zijlstra Cc: Sasha Levin Cc: Stefano Stabellini Cc: Stephen Hemminger Cc: Thomas Gleixner Cc: x86-ml Cc: xen-devel@lists.xenproject.org Link: https://lkml.kernel.org/r/1559108037-18813-2-git-send-email-yakui.zhao@intel.com --- arch/x86/Kconfig | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/x86/Kconfig') diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 2bbbd4d1ba31..c9ab09004b16 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -781,6 +781,9 @@ config PARAVIRT_SPINLOCKS If you are unsure how to answer this question, answer Y. +config X86_HV_CALLBACK_VECTOR + def_bool n + source "arch/x86/xen/Kconfig" config KVM_GUEST -- cgit v1.2.3 From ec7972c99fffb4d2739f286ce9b544a71aa1d05f Mon Sep 17 00:00:00 2001 From: Zhao Yakui Date: Tue, 30 Apr 2019 11:45:24 +0800 Subject: x86: Add support for Linux guests on an ACRN hypervisor ACRN is an open-source hypervisor maintained by The Linux Foundation. It is built for embedded IOT with small footprint and real-time features. Add ACRN guest support so that it allows Linux to be booted under the ACRN hypervisor. This adds only the barebones implementation. [ bp: Massage commit message and help text. ] Co-developed-by: Jason Chen CJ Signed-off-by: Jason Chen CJ Signed-off-by: Zhao Yakui Signed-off-by: Borislav Petkov Reviewed-by: Thomas Gleixner Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Thomas Gleixner Cc: x86-ml Link: https://lkml.kernel.org/r/1559108037-18813-3-git-send-email-yakui.zhao@intel.com --- arch/x86/Kconfig | 10 ++++++++++ arch/x86/include/asm/hypervisor.h | 1 + arch/x86/kernel/cpu/Makefile | 1 + arch/x86/kernel/cpu/acrn.c | 39 +++++++++++++++++++++++++++++++++++++++ arch/x86/kernel/cpu/hypervisor.c | 4 ++++ 5 files changed, 55 insertions(+) create mode 100644 arch/x86/kernel/cpu/acrn.c (limited to 'arch/x86/Kconfig') diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index c9ab09004b16..8a95c50e5c12 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -835,6 +835,16 @@ config JAILHOUSE_GUEST cell. You can leave this option disabled if you only want to start Jailhouse and run Linux afterwards in the root cell. +config ACRN_GUEST + bool "ACRN Guest support" + depends on X86_64 + help + This option allows to run Linux as guest in the ACRN hypervisor. ACRN is + a flexible, lightweight reference open-source hypervisor, built with + real-time and safety-criticality in mind. It is built for embedded + IOT with small footprint and real-time features. More details can be + found in https://projectacrn.org/. + endif #HYPERVISOR_GUEST source "arch/x86/Kconfig.cpu" diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h index 8c5aaba6633f..50a30f6c668b 100644 --- a/arch/x86/include/asm/hypervisor.h +++ b/arch/x86/include/asm/hypervisor.h @@ -29,6 +29,7 @@ enum x86_hypervisor_type { X86_HYPER_XEN_HVM, X86_HYPER_KVM, X86_HYPER_JAILHOUSE, + X86_HYPER_ACRN, }; #ifdef CONFIG_HYPERVISOR_GUEST diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile index 5102bf7c8192..3ffe1b0b7516 100644 --- a/arch/x86/kernel/cpu/Makefile +++ b/arch/x86/kernel/cpu/Makefile @@ -47,6 +47,7 @@ obj-$(CONFIG_X86_CPU_RESCTRL) += resctrl/ obj-$(CONFIG_X86_LOCAL_APIC) += perfctr-watchdog.o obj-$(CONFIG_HYPERVISOR_GUEST) += vmware.o hypervisor.o mshyperv.o +obj-$(CONFIG_ACRN_GUEST) += acrn.o ifdef CONFIG_X86_FEATURE_NAMES quiet_cmd_mkcapflags = MKCAP $@ diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c new file mode 100644 index 000000000000..6d365e97cce6 --- /dev/null +++ b/arch/x86/kernel/cpu/acrn.c @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ACRN detection support + * + * Copyright (C) 2019 Intel Corporation. All rights reserved. + * + * Jason Chen CJ + * Zhao Yakui + * + */ + +#include + +static uint32_t __init acrn_detect(void) +{ + return hypervisor_cpuid_base("ACRNACRNACRN\0\0", 0); +} + +static void __init acrn_init_platform(void) +{ +} + +static bool acrn_x2apic_available(void) +{ + /* + * x2apic is not supported for now. Future enablement will have to check + * X86_FEATURE_X2APIC to determine whether x2apic is supported in the + * guest. + */ + return false; +} + +const __initconst struct hypervisor_x86 x86_hyper_acrn = { + .name = "ACRN", + .detect = acrn_detect, + .type = X86_HYPER_ACRN, + .init.init_platform = acrn_init_platform, + .init.x2apic_available = acrn_x2apic_available, +}; diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c index 479ca4728de0..87e39ad8d873 100644 --- a/arch/x86/kernel/cpu/hypervisor.c +++ b/arch/x86/kernel/cpu/hypervisor.c @@ -32,6 +32,7 @@ extern const struct hypervisor_x86 x86_hyper_xen_pv; extern const struct hypervisor_x86 x86_hyper_xen_hvm; extern const struct hypervisor_x86 x86_hyper_kvm; extern const struct hypervisor_x86 x86_hyper_jailhouse; +extern const struct hypervisor_x86 x86_hyper_acrn; static const __initconst struct hypervisor_x86 * const hypervisors[] = { @@ -49,6 +50,9 @@ static const __initconst struct hypervisor_x86 * const hypervisors[] = #ifdef CONFIG_JAILHOUSE_GUEST &x86_hyper_jailhouse, #endif +#ifdef CONFIG_ACRN_GUEST + &x86_hyper_acrn, +#endif }; enum x86_hypervisor_type x86_hyper_type; -- cgit v1.2.3 From 498ad39368865dfdbf15d3516c43694947074b88 Mon Sep 17 00:00:00 2001 From: Zhao Yakui Date: Tue, 30 Apr 2019 11:45:25 +0800 Subject: x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN guest upcall vector Use the HYPERVISOR_CALLBACK_VECTOR to notify an ACRN guest. Co-developed-by: Jason Chen CJ Signed-off-by: Jason Chen CJ Signed-off-by: Zhao Yakui Signed-off-by: Borislav Petkov Reviewed-by: Thomas Gleixner Cc: Andy Lutomirski Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Thomas Gleixner Cc: x86-ml Link: https://lkml.kernel.org/r/1559108037-18813-4-git-send-email-yakui.zhao@intel.com --- arch/x86/Kconfig | 1 + arch/x86/entry/entry_64.S | 5 +++++ arch/x86/include/asm/acrn.h | 11 +++++++++++ arch/x86/kernel/cpu/acrn.c | 30 ++++++++++++++++++++++++++++++ 4 files changed, 47 insertions(+) create mode 100644 arch/x86/include/asm/acrn.h (limited to 'arch/x86/Kconfig') diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 8a95c50e5c12..0ddcce78f85c 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -838,6 +838,7 @@ config JAILHOUSE_GUEST config ACRN_GUEST bool "ACRN Guest support" depends on X86_64 + select X86_HV_CALLBACK_VECTOR help This option allows to run Linux as guest in the ACRN hypervisor. ACRN is a flexible, lightweight reference open-source hypervisor, built with diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 11aa3b2afa4d..2fe62893bbdf 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -1142,6 +1142,11 @@ apicinterrupt3 HYPERV_STIMER0_VECTOR \ hv_stimer0_callback_vector hv_stimer0_vector_handler #endif /* CONFIG_HYPERV */ +#if IS_ENABLED(CONFIG_ACRN_GUEST) +apicinterrupt3 HYPERVISOR_CALLBACK_VECTOR \ + acrn_hv_callback_vector acrn_hv_vector_handler +#endif + idtentry debug do_debug has_error_code=0 paranoid=1 shift_ist=IST_INDEX_DB ist_offset=DB_STACK_OFFSET idtentry int3 do_int3 has_error_code=0 create_gap=1 idtentry stack_segment do_stack_segment has_error_code=1 diff --git a/arch/x86/include/asm/acrn.h b/arch/x86/include/asm/acrn.h new file mode 100644 index 000000000000..4adb13f08af7 --- /dev/null +++ b/arch/x86/include/asm/acrn.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_ACRN_H +#define _ASM_X86_ACRN_H + +extern void acrn_hv_callback_vector(void); +#ifdef CONFIG_TRACING +#define trace_acrn_hv_callback_vector acrn_hv_callback_vector +#endif + +extern void acrn_hv_vector_handler(struct pt_regs *regs); +#endif /* _ASM_X86_ACRN_H */ diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c index 6d365e97cce6..676022e71791 100644 --- a/arch/x86/kernel/cpu/acrn.c +++ b/arch/x86/kernel/cpu/acrn.c @@ -9,7 +9,12 @@ * */ +#include +#include +#include +#include #include +#include static uint32_t __init acrn_detect(void) { @@ -18,6 +23,8 @@ static uint32_t __init acrn_detect(void) static void __init acrn_init_platform(void) { + /* Setup the IDT for ACRN hypervisor callback */ + alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, acrn_hv_callback_vector); } static bool acrn_x2apic_available(void) @@ -30,6 +37,29 @@ static bool acrn_x2apic_available(void) return false; } +static void (*acrn_intr_handler)(void); + +__visible void __irq_entry acrn_hv_vector_handler(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + + /* + * The hypervisor requires that the APIC EOI should be acked. + * If the APIC EOI is not acked, the APIC ISR bit for the + * HYPERVISOR_CALLBACK_VECTOR will not be cleared and then it + * will block the interrupt whose vector is lower than + * HYPERVISOR_CALLBACK_VECTOR. + */ + entering_ack_irq(); + inc_irq_stat(irq_hv_callback_count); + + if (acrn_intr_handler) + acrn_intr_handler(); + + exiting_irq(); + set_irq_regs(old_regs); +} + const __initconst struct hypervisor_x86 x86_hyper_acrn = { .name = "ACRN", .detect = acrn_detect, -- cgit v1.2.3